code: def getGrid(self, row, col):
      gridIdx = np.array([row, col])
      ul = gridIdx * (self.gridSize - self.overlap)
      lr = ul + self.gridSize
      img = self.detimg[ul[0] : lr[0], ul[1] : lr[1]]
      mask = self.mask_grids[row][col]
      self.curr_idx = (row, col)
      return img, mask
  
file_path: PaddleSeg/EISeg/eiseg/plugin/n2grid/grid.py
imports: import math
  import numpy
  from PIL import Image
label_desc: Use image node_id 4 for calling the Grids obj's underlying member method code with example usage: obj.getGrid(row, col) and returns: img,  mask